Prevalence of overweight and weight gain in relation to night work in a nurses' cohort.

Abstract

OBJECTIVE: To investigate the relation between exposure to night work and prevalence of overweight and weight gain. DESIGN: Longitudinal observational study. SUBJECTS: 469 nurses (age: 21-58 y). MEASUREMENTS: Body Mass Index, exposure to night work, age, parity, smoking and sports activities in 1980, 1985 and 1990. RESULTS: Prevalence of overweight was associated with exposure to night work in 1980 and weight gains (especially those exceeding 7 kg) were more frequent among nurses on night work than on daytime work between 1985 and 1990. CONCLUSION: Exposure to night work can lead to weight gain and overweight.

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